Deterministic generation of a spin-1 Dicke state with more than 10000 atoms
ORAL
Abstract
We report the first generation of a spin-1 Dicke state in the close vicinity of $|l=N,m=0\rangle$ with $N \sim 11700$ $^{87}$Rb atoms. A spinor Bose-Einstein condensate supports various quantum phases due to competition between spin-exchange interaction and quadratic Zeeman energy. In the zero magnetization subspace and assuming the same spatial wave function for all spin components, the ground state of a spin-1 condensate at vanishing magnetic field (or zero quadratic Zeeman shift) is a balanced (or zero magnetization) spin-1 Dicke state. We experimentally generate this spin-1 Dicke state by slowly sweeping the effective quadratic Zeeman shift through a quantum phase transition point from an initial $m_F=0$ condensate. The prepared state is of exceptional quality. It implicates entanglement among all atoms and allows for the demonstration of quantum enhanced measurement.
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